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x in (-oo:+oo)
51*(40/60) = 54*(x/60) // - 54*(x/60)
51*(40/60)-(54*(x/60)) = 0
(-9/10)*x+51*(40/60) = 0
34-9/10*x = 0 // - 34
-9/10*x = -34 // : -9/10
x = -34/(-9/10)
x = 340/9
x = 340/9
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